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0. SCHUBERT. JOINT MEASURING SCALE.

No. 597,330. Patented Jan. 11,1898.

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0. SGHUBERT.

JOINT MEASURING SCALE. 7

No. 597,330. Patented Jan. 11,1898.

WWW wag 1n: Monms vmns ca. mom-Luna. wnsmnsrou a c ber of degrees to the point of the lowest num- UNITED STATES PATENT Brien.

OSKAR SCHUBERT, OF BERLIN, GERMANY, ASSIGNOB TO LUDIVIG HENRICI-I FERDINAND BRUNO HARBERS, OF HAMBURG, GERMANY.

JOINT-NI EAsuRmo scALE.

SPECIFICATION forming part of Letters latent No. 597,330, dated January 11, 1898.

Application filed June 1, 1897- Serial No. 639,020. (No model.)

To all whom it may concern.-

Beit known that I, OSKAR SOHUBERT, a subject of the King of Prussia, German Emperor, and a resident of Berlin, in the Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in J oint- Measurin g Scales, of which the following is an exact specification.

My invention refers to joint measuring scales of the common type; and the object of my improvements in measuring-scales of said type is to adapt the measuring-scale for use as a scale for determining angles. For that purpose I provide two links of the scale, besides the main scale or scale proper, with an auxiliary scale, the parts of which increase in length from the point of the highest number of the same. Said auxiliary scale 006perates with a fixed point that is located on the second link from those bearing the said auxiliary scale, and on bringing that point in contact with any of the numbered lines of division of the auxiliary scale that number will show the numbers of degrees of the angle made by the link having the said fixed point and that link which is located between the former link and those provided with the auxiliary scale.

In order to make my invention more clear, I refer to the accompanying drawings, in which similarletters denote similar parts throughout the different figures, and in which- Figure 1 shows a joint-measuring scale of my improved construction adjusted to represent a right angle. joint-measuring scale adjusted to represent an acute angle, and Fig. 3 shows the jointmeasuring scale adjusted to represent an obtuse angle.

The end link A and the adjoining link A are provided, besides the main scale or measuring-scale proper, a, (which extends along the whole length of the joint-measuring.scale,) with the auxiliary scale it, mentioned hereinbeiore. This scale extends only along the two links A and A, and the parts of the auxiliary scale increase in length in the direction Fig. 2 shows the same from the'link A to the link A, as distinctly shown in the-drawings.

The fourth link A of the joint-measuring scale has a fixed point a (or arrow or other sign,) that is to cooperate with the scale a, or with the parts and numbers of the same, respectively. Theanglethenumherof degrees of which shall be determined is formed by the link A and the link A which connects the link A with the links A A. p

In order to maintain the parts or links A A in a straight line, these parts or links may be provided in any suitable and known manner with spring-catches. The latter may be omitted, as shown in the drawings, in which case the parts or links A A are maintained in a straight line by the person using the nieasur- 6 5 ing-scale.

There are, as a rule, six or eight links in the measuring-scale, and the whole length of the latter amounts to one meter. The other links must thus be supposed to be located below the link A If the arrow points, forinstance, to the number 90 of the auxiliary scale a, then the angle made by the links A A is an angle of ninety degrees. (See Fig. 1.) In any case that number of the auxiliary scale which the point of the arrow (1. points to shows exactly the number of degrees of the angle made by the said-two links.

In Fig. 2 the arrow a points to the number 70, and the angle made by the links A A is thus an angle of seventy degrees.

In Fig. 3 the angle amounts to one hundred and ten degrees, as is proved by the arrow pointing to that number. Having thus fully described the nature of this invention, what I desire to secure by Letters Patent of the United States is- A j oint-measuring scale having besides the main scale or scale proper an auxiliary scale ext-ending over two links of the j oint-n1easuring scale, and a fixed point located upon the second link from those having said auxiliary scale; the latter being divided in parts in creasing in length from the point of the high- 9 5 est numberof degrees to the point of the lowest number of degrees, and said parts being specification in the presence of two subscribnumbered to directly show the degrees of the ing witnesses. an des made 1) the link havin said fixed a point and the Iii]: connecting the former link ObKAR SOHUBERT 5 with those bearing the auxiliary scale, for the Witnesses:

purpose as described. JULIUS MAERNECH, In testimony whereof I have signed this FRITZ SPERLING. 

